Cornerstone Staffing Solutions, Inc.

Cornerstone Staffing's November 2025 ransomware attack, claimed by the Qilin group, leaked job seeker resumes, contact details, and application documents alongside internal corporate files. The filing names the extortion group but never the door it walked through: no vector, no entry point, no count. Even in the presence of a known ransomware attack executed by a notoriously well-known ransomware gang, it took Cornerstone 9 months to determine that the exposed data was worthy of filing an incident report over.